pvr: Fix unaligned VDMCTRL_PDS_STATE1 data address

For indirect draw commands the data segment's address was being
calculated with an unaligned code size which could potentially
send an unaligned address to the hw causing problems.

Reported-by: James Glanville <james.glanville@imgtec.com>
Signed-off-by: Karmjit Mahil <Karmjit.Mahil@imgtec.com>
Reviewed-by: Frank Binns <frank.binns@imgtec.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22746>